Design of axially and laterally loaded piles using <i>in situ</i> tests: A case history

Robertson, P. K.; Campanella, Richard; Brown, Peter; Grof, I.; Hughes, Jmo

doi:10.1139/t85-072

Cited by 27 publications

(8 citation statements)

References 3 publications

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“…Formulae 5 and 7 should be used with factor g equal for sandy soils to 0 at surface and increasing linearly with depth to 1.5 at the critical depth and below. The critical depth was estimated to 4 diameters (Robertson et al 1985). Atukoralla and Byrne (1984) analysed by finite element modelling the lateral displacements of a rigid disk within an elastic plastic material as well as those due the cylindrical cavity expansion within the same material.…”

Section: Methods Ofmentioning

confidence: 99%

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Single piles under horizontal loads in sand: determination of P–Y curves from the prebored pressuremeter test

Bouafia

2006

Geotech Geol Eng

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Lateral load-deflection behaviour of single piles is often analysed in practice on the basis of methods of load-transfer P-Y curves. The paper is aimed at presenting the results of the interpretation of five full-scale horizontal loading tests of single instrumented piles in two sandy soils, in order to define the parameters of P-Y curves, namely the initial lateral reaction modulus and the lateral soil resistance, in correlation with the pressuremeter test parameters. P-Y curve parameters were found varying as a power of lateral pile/soil stiffness, on the basis of which hyperbolic P-Y curves in sand were proposed. The predictive capabilities of the proposed P-Y curves were assessed by predicting the soil/pile response in full-scale tests as well as in centrifuge tests and a very good agreement was found between the computed deflections and bending moments, and the measured ones. Small-sized database of fullscale pile loading tests in sand was built and a comparative study of some commonly used P-Y curve methods was undertaken. Moreover, it was shown that the load-deflection curves of these test piles may be normalised in a practical form for an approximate evaluation of pile deflection in a preliminary stage of pile design. At last, a parametric study undertaken on the basis of the proposed P-Y curves showed the significant influence of the lateral pile/soil stiffness on the nonlinear load-deflection response. Keywords Lateral loading test AE Lateral reaction modulus AE P-Y curves AE Pressuremeter test AE Sand AE Single pile List of symbols and units B diameter or frontal width of the pile (m) D embedded length of the pile (m) D e effective pile length (m) E elastic soil modulus (MPa) e excentricity of lateral load (m) E c characteristic soil modulus (MPa) E m first load pressuremeter modulus (MPa) E r reload pressuremeter modulus (MPa) E ti initial lateral reaction modulus (MPa) E p I p flexural pile stiffness (MN m 2 ) F tangential lateral reaction (kN/m) F l limit tangential lateral reaction or tangential lateral resistance (kN/m) G r pressuremeter shear modulus (G r = E r / [2(1 + m)]) (MPa) H lateral load applied on the pile top (kN) I d density index (%) K pile/soil compressibility K r lateral pile/soil stiffness L tangential dimension of the pile section (parallel to H) (m)

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Section: Methods Ofmentioning

confidence: 99%

“…Uniaxial compression tests of bentonite samples have given a Young's modulus of 3,500 MPa at 28 days. Usual correlation p f % p l /2 Dunand (1981) 1.00 Briaud et al (1982) 0.83 Bored pile in sand Baguelin et al (1977) 0.3-3.0 Robertson et al (1984Robertson et al ( , 1985 1.50…”

Section: Test Pilesmentioning

confidence: 99%

Single piles under horizontal loads in sand: determination of P–Y curves from the prebored pressuremeter test

Bouafia

2006

Geotech Geol Eng

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“…It should be emphasized that several other correlations have been proposed and that wide variations exist between some of these. Robertson et al (1985) have found the method proposed by Schmertmann to provide a more reliable prediction than the direct correlation to q c , when applied to piles in a clayey silt. 27 shows an example of this variability, for driven piles in silica sand.…”

Section: Shaft Resistance F %mentioning

confidence: 99%

Landmarks in soil mechanics: the Rankine Lectures 1981-1990

Rankine¹

1992

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POULOS an invited speaker at international conferences all over the world, renowned for his fluent delivery, entertaining style and well-informed and chal lenging comments.Harry Poulos is a distinguished engineer carry ing out all his commitments with ease-the four E's-excellence, elegance, economy and efficiency. It is with the greatest pleasure and expectation that, on behalf of the British Geotechnical Society, I invite Professor Harry George Poulos to deliver the twenty-ninth Rankine Lecture.

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“…However, such attempts have focused on the soil part of soil pile interaction behaviors. Robertson et al (1985) developed a method that used the results of a pushed in pressuremeter to evaluate p-y curves of a driven displacement pile. Attempts towards deriving p-y curves using three dimensional finite element model has been provided by Brown Shie (1990, 1991).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Pile–Soil Interaction under Axial and Lateral Loads

Khodair

Abdel-Mohti

2014

Int J Concr Struct Mater

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In this paper, the analysis of a numerical study of pile-soil interaction subjected to axial and lateral loads is presented. An analysis of the composite pile-soil system was performed using the finite difference (FD) software LPILE. Two three dimensional, finite element (FE) models of pile-soil interaction have been developed using Abaqus/Cae and SAP2000 to study the effect of lateral loading on pile embedded in clay. A lateral displacement of 2 cm was applied to the top of the pile, which is embedded into the concrete pile cap, while maintaining a zero slope in a guided fixation. A comparison between the bending moments and lateral displacements along the depth of the pile obtained from the FD solutions and FE was performed. A parametric study was conducted to study the effect of crucial design parameters such as the soil's modulus of elasticity, radius of the soil surrounding the pile in Abaqus/Cae, and the number of springs in SAP2000. A close correlation is found between the results obtained by the FE models and the FD solution. The results indicated that increasing the amount of clay surrounding the piles reduces the induced bending moments and lateral displacements in the piles and hence increases its capacity to resist lateral loading.

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Design of axially and laterally loaded piles using in situ tests: A case history

Cited by 27 publications

References 3 publications

Single piles under horizontal loads in sand: determination of P–Y curves from the prebored pressuremeter test

Single piles under horizontal loads in sand: determination of P–Y curves from the prebored pressuremeter test

Landmarks in soil mechanics: the Rankine Lectures 1981-1990

Numerical Analysis of Pile–Soil Interaction under Axial and Lateral Loads

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